Citation needed.

There's a 10BASE-T1 but this says it's very recent?

10BASE-T and 100BASE-TX are very similar except for the line encoding. One pair each way.

Coax uses one line, but that's not using twisted pairs at all.

*-T1 Ethernet was designed by Broadcom and the car manufacturers to implement single pair ethernet for automotive applications. Specifically for things like backup cameras, ADAS, etc. The standard is less than 10 years old and has nothing to do with 10base-T.

https://en.wikipedia.org/wiki/BroadR-Reach

100Base-T1 has more in common with 1000BASE-T than the legacy standards, imagine if you took a single pair from the 4 needed to do Gigabit.

This is simply incorrect. 10Base-T is two pairs, one TX one RX. Source: am expert, have designed low level ethernet hardware.

It amazes me how much misinformation gets posted on HN with convincing authority.

10base-T1S and 10base-T1L are single pair. Though I didn’t realise they’re a modern standard until I just looked it up.

Coax is also two ”wires”, though obviously not twisted.

I used to do networking professionally too. Though it looks like I’ve gotten rather rusty on the basics.